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2018 LINCOLN MKT
3.7L V6•FWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor486Torque3114Fluid7DTC1907Battery1Maintenance0Recalls2
P0546moderate severityPowertrain

Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

on 2018 Lincoln MKT 3.7L V6 · FWD

What this code means

The PCM detected a high voltage signal from the exhaust gas temperature sensor. This sensor helps protect the turbocharger and exhaust aftertreatment from overheating.

Symptoms

  • Check engine light on
  • Reduced engine power
  • Possible limp mode

Common causes

  • Faulty exhaust gas temperature sensor
  • Open in sensor wiring
  • Corroded or loose connector
  • Failed PCM input circuit

Diagnostic steps

  1. Read sensor data with scan tool
  2. Inspect wiring for opens
  3. Measure sensor resistance and signal
  4. Compare with known good temperature reading
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